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                [Usaco2013 Jan]Seating                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">To earn some extra money, the cows have opened a restaurant in their barn specializing in milkshakes. The restaurant has N seats (1 &lt;= N &lt;= 500,000) in a row. Initially, they are all empty. Throughout the day, there are M different events that happen in sequence at the restaurant (1 &lt;= M &lt;= 300,000). The two types of events that can happen are: 1. A party of size p arrives (1 &lt;= p &lt;= N). Bessie wants to seat the party in a contiguous block of p empty seats. If this is possible, she does so in the lowest position possible in the list of seats. If it is impossible, the party is turned away. 2. A range [a,b] is given (1 &lt;= a &lt;= b &lt;= N), and everybody in that range of seats leaves. Please help Bessie count the total number of parties that are turned away over the course of the day. </span></p>
<p></p>
<div><span style="font-size: 12pt">m(m&lt;=300,000)</span><span style="font-size: 12pt">个操作。操作分</span><span style="font-size: 12pt">2</span><span style="font-size: 12pt">种：</span></div>
<div style="text-indent: -18pt; margin: 0cm 0cm 0pt 29.25pt"><span style="font-size: 12pt">1.</span><span style="font-size: 12pt">A p</span><span style="font-size: 12pt">，表示把编号最小的空着的长度为</span><span style="font-size: 12pt">p</span><span style="font-size: 12pt">的区间图上颜色。</span></div>
<div style="text-indent: -18pt; margin: 0cm 0cm 0pt 29.25pt"><span style="font-size: 12pt">2.</span><span style="font-size: 12pt">L a b</span><span style="font-size: 12pt">，表示把从</span><span style="font-size: 12pt">a</span><span style="font-size: 12pt">到</span><span style="font-size: 12pt">b</span><span style="font-size: 12pt">的区间（包括端点）全部擦干净（没颜色还是没颜色）。</span></div>
<div><span style="font-size: 12pt">Q</span><span style="font-size: 12pt">：有多少个操作</span><span style="font-size: 12pt">1</span><span style="font-size: 12pt">不能实现？</span></div>
<div>&nbsp;</div></p><hr/><h3>输入格式</h3><p><p>&nbsp;</p>
<p><span style="font-size: medium">* Line 1: Two space-separated integers, N and M. <br />
* Lines 2..M+1: Each line describes a single event. It is either a line of the form &quot;A p&quot; (meaning a party of size p arrives) or &quot;L a b&quot; (meaning that all cows in the range [a, b] leave).<br />
</span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">&nbsp;* Line 1: The number of parties that are turned away. </span></p>
<p>&nbsp;</p></p><hr/><h3>样例输入</h3><pre>10 4 
A 6 
L 2 4 
A 5 
A 2
 INPUT DETAILS: There are 10 seats, and 4 events. First, a party of 6 cows arrives. Then all cows in seats 2..4 depart. Next, a party of 5 arrives, followed by a party of 2. 

 </pre><hr/><h3>样例输出</h3><pre>1 

OUTPUT DETAILS: Party #3 is turned away. All other parties are seated. 


 
</pre><hr/><h3>提示</h3><p><div><span style="font-size: 12pt">样例解释：</span></div>
<div><span style="font-size: 12pt">&nbsp; </span><span style="font-size: 12pt">首先将</span><span style="font-size: 12pt">1~6</span><span style="font-size: 12pt">图上颜色，再把</span><span style="font-size: 12pt">2~4</span><span style="font-size: 12pt">擦掉，这时不存在长度为</span><span style="font-size: 12pt">5</span><span style="font-size: 12pt">的空着的区间，该操作不能实现，跳过。最后把</span><span style="font-size: 12pt">2~3</span><span style="font-size: 12pt">图上颜色。所以不能实现的操作</span><span style="font-size: 12pt">1</span><span style="font-size: 12pt">有一个，即第三个操作。</span></div></p><hr/><h3>题目来源</h3><p>Gold</p>
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